/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.seata.saga.statelang.validator.impl;

import org.apache.seata.saga.statelang.domain.State;
import org.apache.seata.saga.statelang.domain.StateMachine;
import org.apache.seata.saga.statelang.parser.utils.StateMachineUtils;

import java.util.Set;

/**
 * Rule to check if all the state name exists
 *
 */
public class StateNameExistsRule extends AbstractRule {

    @Override
    public boolean validate(StateMachine stateMachine) {
        for (State state : stateMachine.getStates().values()) {
            Set<String> subsequentStates = StateMachineUtils.getAllPossibleSubsequentStates(state);
            for (String subsequentState : subsequentStates) {
                if (stateMachine.getState(subsequentState) == null) {
                    hint = String.format("Subsequent state [%s] of [%s] does not exist", subsequentState, state);
                    return false;
                }
            }
        }
        return true;
    }
}
